{"id":12146,"date":"2021-11-24T20:05:15","date_gmt":"2021-11-24T13:05:15","guid":{"rendered":"https:\/\/www.vietlearn.org\/post\/?p=12146"},"modified":"2021-11-24T20:05:16","modified_gmt":"2021-11-24T13:05:16","slug":"vi-sao-khong-duoc-ket-hon-can-huyet","status":"publish","type":"post","link":"https:\/\/www.vietlearn.org\/kien-thuc\/vi-sao-khong-duoc-ket-hon-can-huyet\/","title":{"rendered":"V\u00ec sao kh\u00f4ng \u0111\u01b0\u1ee3c k\u1ebft h\u00f4n c\u1eadn huy\u1ebft"},"content":{"rendered":"\n<p>&#8220;Sau ti\u1ebft <a href=\"https:\/\/www.vietlearn.org\" data-internallinksmanager029f6b8e52c=\"2\" title=\"Vietlearn\" rel=\"nofollow\">h\u1ecdc sinh<\/a> v\u1eadt l\u1edbp 9 v\u1ec1 t\u1ef1 th\u1ee5 ph\u1ea5n v\u00e0 giao ph\u1ed5i g\u1ea7n, c\u00f4 gi\u00e1o \u0111\u1eb7t th\u00eam c\u00e2u h\u1ecfi: H\u00e3y gi\u1ea3i th\u00edch c\u01a1 s\u1edf khoa h\u1ecdc c\u1ee7a vi\u1ec7c c\u1ea5m k\u1ebft h\u00f4n th\u00e2n thu\u1ed9c . Em ch\u01b0a th\u1ec3 tr\u1ea3 l\u1eddi \u0111\u01b0\u1ee3c c\u00e2u h\u1ecfi n\u00e0y&#8221;.<\/p>\n\n\n\n<p>N\u00f3i &#8220;k\u1ebft h\u00f4n c\u1eadn huy\u1ebft&#8221; c\u00f3 l\u1ebd ch\u00ednh x\u00e1c h\u01a1n &#8220;k\u1ebft h\u00f4n th\u00e2n thu\u1ed9c&#8221;. Em h\u00e3y quan s\u00e1t hi\u1ec7n t\u01b0\u1ee3ng sinh s\u1ea3n trong l\u1ee3n g\u00e0 th\u00ec th\u1ea5y: N\u1ebfu \u0111\u1ec3 cho nh\u1eefng con v\u1eadt c\u00f9ng l\u1ee9a (ho\u1eb7c l\u1ee9a ngay tr\u01b0\u1edbc \u0111\u00f3) giao ph\u1ed1i v\u1edbi nhau, con c\u00e1i c\u1ee7a ch\u00fang s\u1ebd ng\u00e0y c\u00e0ng k\u00e9m c\u1ecfi. Tr\u00e1i l\u1ea1i, n\u1ebfu cho giao ph\u1ed1i v\u1edbi nh\u1eefng con xa l\u1ea1, ch\u00fang s\u1ebd ph\u00e1t tri\u1ec3n t\u1ed1t.<\/p>\n\n\n\n<p>\u1ede con ng\u01b0\u1eddi c\u0169ng t\u01b0\u01a1ng t\u1ef1. M\u1ed9t s\u1ed1 b\u1ed9 t\u1ed9c, th\u1eadm ch\u00ed d\u00e2n t\u1ed9c, cho anh em, ch\u1ecb em con ch\u00fa b\u00e1c ru\u1ed9t, c\u00f4 c\u1eadu ru\u1ed9t hay d\u00ec gi\u00e0 ru\u1ed9t l\u1ea5y nhau. Nh\u1eefng gia \u0111\u00ecnh nh\u01b0 v\u1eady hay g\u1eb7p hi\u1ec7n t\u01b0\u1ee3ng &#8220;tho\u00e1i h\u00f3a&#8221; v\u1ec1 n\u00f2i gi\u1ed1ng (tr\u00ed l\u1ef1c gi\u1ea3m s\u00fat, m\u1ed9t s\u1ed1 d\u1ecb t\u1eadt b\u1ea9m sinh lan tr\u00e0n\u2026).<\/p>\n\n\n\n<p>V\u00ec sao nh\u01b0 v\u1eady? Ta c\u00f3 th\u1ec3 h\u00ecnh dung m\u1ed9t c\u00e1ch d\u1ec5 hi\u1ec3u nh\u01b0 sau: Trong t\u1eebng c\u00e1 th\u1ec3, bao gi\u1edd c\u0169ng c\u00f3 m\u1ed9t s\u1ed1 gene x\u1ea5u nh\u01b0ng kh\u00f4ng bi\u1ec3u hi\u1ec7n (gene l\u1eb7n). Khi giao ph\u1ed1i c\u1eadn huy\u1ebft, c\u00e1c gene x\u1ea5u t\u01b0\u01a1ng t\u1ef1 c\u1ee7a no\u00e3n v\u00e0 tinh tr\u00f9ng c\u00f3 \u0111i\u1ec1u ki\u1ec7n k\u1ebft h\u1ee3p v\u1edbi nhau \u0111\u1ec3 tr\u1edf th\u00e0nh gene tr\u1ed9i, bi\u1ec3u hi\u1ec7n ra ngo\u00e0i. N\u1ebfu giao ph\u1ed1i c\u1eadn huy\u1ebft ti\u1ebfp t\u1ee5c qua nhi\u1ec1u th\u1ebf h\u1ec7 th\u00ec s\u1ef1 tho\u00e1i h\u00f3a nghi\u00eam tr\u1ecdng l\u00e0 \u0111i\u1ec1u c\u1ea7m ch\u1eafc. Trong l\u1ecbch s\u1eed, \u0111\u00e3 c\u00f3 m\u1ed9t s\u1ed1 d\u00f2ng h\u1ecd do t\u1eadp t\u1ee5c k\u1ebft h\u00f4n c\u1eadn huy\u1ebft m\u00e0 tr\u1edf th\u00e0nh t\u1ed3i t\u1ec7, th\u1eadm ch\u00ed ti\u00eau vong. Ch\u00ednh v\u00ec v\u1eady m\u00e0 trong h\u00f4n nh\u00e2n, ng\u01b0\u1eddi ta c\u1ea5m c\u00e1c c\u00e1 th\u1ec3 c\u1eadn huy\u1ebft tr\u1edf th\u00e0nh v\u1ee3 ch\u1ed3ng.<\/p>\n\n\n\n<p>Trong h\u00f4n ph\u1ed1i, 2 c\u00e1 th\u1ec3 c\u00e0ng kh\u00e1c nhau xa v\u1ec1 di truy\u1ec1n c\u00e0ng t\u1ed1t, con c\u00e1i s\u1ebd ph\u00e1t tri\u1ec3n \u0111\u1ee9c t\u00ednh v\u00e0 h\u1ea1n ch\u1ebf nh\u01b0\u1ee3c \u0111i\u1ec3m (c\u00f3 d\u00e2n t\u1ed9c nh\u1edd giao l\u01b0u r\u1ed3i k\u1ebft h\u00f4n r\u1ed9ng r\u00e3i v\u1edbi ng\u01b0\u1eddi c\u00e1c d\u00e2n t\u1ed9c kh\u00e1c m\u00e0 d\u1ea7n d\u00e0 c\u00f3 \u0111\u01b0\u1ee3c tr\u00ed \u00f3c th\u00f4ng minh h\u01a1n v\u00e0 th\u1ec3 t\u1ea1ng kh\u1ecfe \u0111\u1eb9p h\u01a1n so v\u1edbi thuc\u00f2n &#8220;tr\u00e2u ta \u0103n c\u1ecf \u0111\u1ed3ng ta&#8221;).<\/p>\n","protected":false},"excerpt":{"rendered":"<p>&#8220;Sau ti\u1ebft h\u1ecdc sinh v\u1eadt l\u1edbp 9 v\u1ec1 t\u1ef1 th\u1ee5 ph\u1ea5n v\u00e0 giao ph\u1ed5i g\u1ea7n, c\u00f4 gi\u00e1o \u0111\u1eb7t th\u00eam c\u00e2u h\u1ecfi: H\u00e3y gi\u1ea3i th\u00edch c\u01a1 s\u1edf khoa h\u1ecdc c\u1ee7a vi\u1ec7c c\u1ea5m k\u1ebft h\u00f4n th\u00e2n thu\u1ed9c . Em ch\u01b0a th\u1ec3 tr\u1ea3 l\u1eddi \u0111\u01b0\u1ee3c c\u00e2u h\u1ecfi n\u00e0y&#8221;. N\u00f3i &#8220;k\u1ebft h\u00f4n c\u1eadn huy\u1ebft&#8221; c\u00f3 l\u1ebd ch\u00ednh x\u00e1c h\u01a1n [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":"","_disable_autopaging":false},"categories":[21],"tags":[],"class_list":["post-12146","post","type-post","status-publish","format-standard","hentry","category-y-hoc"],"_links":{"self":[{"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/posts\/12146","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/comments?post=12146"}],"version-history":[{"count":0,"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/posts\/12146\/revisions"}],"wp:attachment":[{"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/media?parent=12146"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/categories?post=12146"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/tags?post=12146"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}